Apparatus for removing deposits and the like from surfaces



' May 29, 1928. 1,671,684

J. C. SCHMIDT APPARATUS FOR REMOVING DE POSITS AND THE LIKE FROM SURFACES Filed Nov. 6, 1925 Patented May 29, 192

PATENT OFFICE.

JOHAN CHRISTIAN SCHMIDT, OF COPENHAGEN DENMARK.

APPARATUS FOR REMOVING DEPOSITS AND THE LIKE FROM SURFACES.

Application filed November 6, 1923, Serial No. 673,213, and in Denmark August 29, 1923.

The present invention relates to an apparatus for removing deposits from surfaces, for example scale from boiler-tubes. The apparatus is of that kind in which in combination with a rapidly revolving shaft are provided toothed discs with hard and sharp teeth, which will be driven by the centrifugal force outwardly against the deposits to be removed. The characteristic feature of the present invention'consists in this that the said discs are fitted beside each other on a pin bent to a helical line and coupled to a rapidly rotating flexible shaft.

In the accompanying drawing two constructional forms of the invention are shown by way of example, Fig. 1 being an apparatus which is specially intended for clean ing boiler pipes, in side elevation, Fig. 2 a cross sectional View of the said apparatus, and Fig. 3 a detail end elevation of the pin bent to a helical line. i a

A rotary cable, which is enclosed in a flexible tube or sheath, ends in a pin 6. To this pin is attached a short cable a, to the other end of which is fitted a head 0. Into the latter is screwed a pin (1 which is helical in form. On the outer end of this pin (Z is screwed a nut 6.

On the said pin (Z are fitted a plurality of, say some fifty toothed discs f, the bore of which is somewhat greater than the diameter These discsare quite flat and of the pin (Z. are Provided s l g heir edge witl'rhard sharp teeth. a

When the apparatus is to be used, the pin cl with its discs f is inserted into the boiler tube to be cleaned whereupon the motor which rotates the flexible shaft a is started. Thereby the pin 65 is revolved at a very high speed whereby the discs are flung outwards against the walls of the tube. The apparatus can now be pushed furtherinto the tube or, if so desired he moved backward and forward in the sam'euntil all scale has been removed. The flexible shaft should not be pushed so far into the tubes that the pin d with its discs f passes out of the' boiler tube, as then the flexible piece between the sheath, 6 and the head 0 would be flung around and could not be drawn back into the tube but would be easily damaged.

I claim:

An apparatus for removing deposits or the like from surfaces, comprising scraping members each consisting of a flat toothed disc having hard and sharp teeth, a pin bent to a helical line and coupled to a rapidly rotating-flexible shaft, the said discs being loosely revolubly mounted. on said pin in superposed relation and disposed between two fixed stops on said pin and unable to move in an axial direction on said pin, but arranged to move within certain limits relatively to each other in a radial direction.

In witness whereof he affixes his signature.

JOHAN CHRISTIAN SCHMIDT. 

